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ROSCO filter glass pics

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#1 Andy Perrin

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Posted 08 June 2019 - 16:14

For my earliest UV experiments (before joining the board), my first attempt was with this "Rosco Permacolor Filter — UV Woods Glass" (P/N 120 33650 7508) which transmits copious amounts of IR and some visible also. I did not at first understand why I wasn't seeing photos that showed the known UV flower patterns. Today I stumbled on the glass while looking for something else, so I thought I'd give it a try using some S8612 1.75mm to block the IR leak. (This still leaves the visible leaks, but they don't seem to dominate.)

Here is a photo with just the ROSCO filter (no S8612). Lens was EL-Nikkor 80mm/5.6 metal, camera was converted Sony A7S, processing was just for contrast and to remove a couple of dust bunnies. I white balanced in PN off the pavement.
Attached Image: _DSC1902 ROSCO only, wb in PN off pavement.jpg

Here is with ROSCO + S8612 1.75mm, everything else as above (except exposure):
Attached Image: _DSC1903 ROSCO + S8612 1.75mm, WB in PN off pavement.jpg

Here is the first photo but with Photoshop autotone, which made it look nicer:
Attached Image: _DSC1902 ROSCO only, wb in PN off pavement + autotone.jpg

#2 Cadmium

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Posted 08 June 2019 - 22:51

Your Rosco is transmitting like a UG5 or U-330, with obvious amounts of visual blue and green. AKA 'bee vision'.

#3 Cadmium

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Posted 09 June 2019 - 04:27

Andy, I can't find a graph for the Rosco you mention.

#4 Andy Perrin

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Posted 09 June 2019 - 06:02

Cadmium, I couldn’t either. It was bought quite a while ago. I did find a graph of an updated version of that filter that showed a passband from 360-440nm. And an IR leak.

#5 Andy Perrin

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Posted 09 June 2019 - 06:25

Like, see this one. I do not think it's the exact same filter, but it may be the successor to it:
https://us.rosco.com...-coated-uv-pass

Attached Image: 3660.jpg

Edited by Andy Perrin, 09 June 2019 - 06:26.